fix(tf): fix compatibility with TF 2.20

.devcontainer/build_cxx.sh

@@ -5,7 +5,7 @@ NPROC=$(nproc --all)
 SCRIPT_PATH=$(dirname $(realpath -s $0))
 
 export CMAKE_PREFIX_PATH=${SCRIPT_PATH}/../libtorch
-TENSORFLOW_ROOT=$(python -c 'import importlib,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
+TENSORFLOW_ROOT=$(python -c 'import importlib.util,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
 
 mkdir -p ${SCRIPT_PATH}/../buildcxx/
 cd ${SCRIPT_PATH}/../buildcxx/

.devcontainer/gdb_lmp

@@ -2,7 +2,7 @@
 SCRIPT_PATH=$(dirname $(realpath -s $0))
 
 export CMAKE_PREFIX_PATH=${SCRIPT_PATH}/../libtorch
-TENSORFLOW_ROOT=$(python -c 'import importlib,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
+TENSORFLOW_ROOT=$(python -c 'import importlib.util,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
 
 env LAMMPS_PLUGIN_PATH=${SCRIPT_PATH}/../dp/lib/deepmd_lmp \
 	LD_LIBRARY_PATH=${SCRIPT_PATH}/../dp/lib:${CMAKE_PREFIX_PATH}/lib:${TENSORFLOW_ROOT} \

.devcontainer/gdb_pytest_lmp

@@ -2,7 +2,7 @@
 SCRIPT_PATH=$(dirname $(realpath -s $0))/../..
 
 export CMAKE_PREFIX_PATH=${SCRIPT_PATH}/../libtorch
-TENSORFLOW_ROOT=$(python -c 'import importlib,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
+TENSORFLOW_ROOT=$(python -c 'import importlib.util,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
 
 env LAMMPS_PLUGIN_PATH=${SCRIPT_PATH}/../dp/lib/deepmd_lmp \
 	LD_LIBRARY_PATH=${SCRIPT_PATH}/../dp/lib:${CMAKE_PREFIX_PATH}/lib:${TENSORFLOW_ROOT} \

.devcontainer/lmp

@@ -2,7 +2,7 @@
 SCRIPT_PATH=$(dirname $(realpath -s $0))
 
 export CMAKE_PREFIX_PATH=${SCRIPT_PATH}/../libtorch
-TENSORFLOW_ROOT=$(python -c 'import importlib,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
+TENSORFLOW_ROOT=$(python -c 'import importlib.util,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
 
 env LAMMPS_PLUGIN_PATH=${SCRIPT_PATH}/../dp/lib/deepmd_lmp \
 	LD_LIBRARY_PATH=${SCRIPT_PATH}/../dp/lib:${CMAKE_PREFIX_PATH}/lib:${TENSORFLOW_ROOT} \

.devcontainer/pytest_lmp

@@ -2,7 +2,7 @@
 SCRIPT_PATH=$(dirname $(realpath -s $0))/../..
 
 export CMAKE_PREFIX_PATH=${SCRIPT_PATH}/../libtorch
-TENSORFLOW_ROOT=$(python -c 'import importlib,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
+TENSORFLOW_ROOT=$(python -c 'import importlib.util,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
 
 env LAMMPS_PLUGIN_PATH=${SCRIPT_PATH}/../dp/lib/deepmd_lmp \
 	LD_LIBRARY_PATH=${SCRIPT_PATH}/../dp/lib:${CMAKE_PREFIX_PATH}/lib:${TENSORFLOW_ROOT} \

.github/workflows/test_cc.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Install Python dependencies
       run: |
         source/install/uv_with_retry.sh pip install --system tensorflow-cpu~=2.18.0 jax==0.5.0
-        export TENSORFLOW_ROOT=$(python -c 'import importlib,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
+        export TENSORFLOW_ROOT=$(python -c 'import importlib.util,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
         source/install/uv_with_retry.sh pip install --system -e .[cpu,test,lmp,jax] mpi4py mpich
         source/install/uv_with_retry.sh pip install --system 'torch==2.7' --index-url https://download.pytorch.org/whl/cpu
     - name: Convert models

.github/workflows/test_cuda.yml

@@ -46,7 +46,7 @@ jobs:
     - run: source/install/uv_with_retry.sh pip install --system "tensorflow~=2.18.0rc2" "torch~=2.7.0" "jax[cuda12]==0.5.0"
     - run: |
         export PYTORCH_ROOT=$(python -c 'import torch;print(torch.__path__[0])')
-        export TENSORFLOW_ROOT=$(python -c 'import importlib,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
+        export TENSORFLOW_ROOT=$(python -c 'import importlib.util,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
         pip install "paddlepaddle-gpu==3.0.0" -i https://www.paddlepaddle.org.cn/packages/stable/cu126/
         source/install/uv_with_retry.sh pip install --system -v -e .[gpu,test,lmp,cu12,torch,jax] mpi4py --reinstall-package deepmd-kit
       env:

.github/workflows/test_python.yml

@@ -27,7 +27,7 @@ jobs:
     - run: |
         source/install/uv_with_retry.sh pip install --system openmpi tensorflow-cpu~=2.18.0
         source/install/uv_with_retry.sh pip install --system torch -i https://download.pytorch.org/whl/cpu
-        export TENSORFLOW_ROOT=$(python -c 'import tensorflow;print(tensorflow.__path__[0])')
+        export TENSORFLOW_ROOT=$(python -c 'import importlib.util,pathlib;print(pathlib.Path(importlib.util.find_spec("tensorflow").origin).parent)')
         export PYTORCH_ROOT=$(python -c 'import torch;print(torch.__path__[0])')
         source/install/uv_with_retry.sh pip install --system -e .[test,jax] mpi4py "jax==0.5.0;python_version>='3.10'"
         source/install/uv_with_retry.sh pip install --system -U setuptools

backend/find_tensorflow.py

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: LGPL-3.0-or-later
 import os
+import re
 import site
 from functools import (
     lru_cache,
@@ -56,6 +57,10 @@ def find_tensorflow() -> tuple[Optional[str], list[str]]:
     ) is not None:
         site_packages = Path(os.environ.get("TENSORFLOW_ROOT")).parent.absolute()
         tf_spec = FileFinder(str(site_packages)).find_spec("tensorflow")
+        if tf_spec is None:
+            raise RuntimeError(
+                f"cannot find TensorFlow under TENSORFLOW_ROOT {os.environ.get('TENSORFLOW_ROOT')}"
+            )
 
     # get tensorflow spec
     # note: isolated build will not work for backend
@@ -153,7 +158,8 @@ def get_tf_requirement(tf_version: str = "") -> dict:
                 "tensorflow-cpu; platform_machine!='aarch64' and (platform_machine!='arm64' or platform_system != 'Darwin')",
                 "tensorflow; platform_machine=='aarch64' or (platform_machine=='arm64' and platform_system == 'Darwin')",
                 # https://github.com/tensorflow/tensorflow/issues/61830
-                "tensorflow-cpu!=2.15.*; platform_system=='Windows'",
+                # Since TF 2.20, not all symbols are exported to the public API.
+                "tensorflow-cpu!=2.15.*,<2.20; platform_system=='Windows'",
                 # https://github.com/h5py/h5py/issues/2408
                 "h5py>=3.6.0,!=3.11.0; platform_system=='Linux' and platform_machine=='aarch64'",
                 *extra_requires,
@@ -228,6 +234,22 @@ def get_tf_version(tf_path: Optional[Union[str, Path]]) -> str:
                 patch = line.split()[-1]
             elif line.startswith("#define TF_VERSION_SUFFIX"):
                 suffix = line.split()[-1].strip('"')
+    if None in (major, minor, patch):
+        # since TF 2.20.0, version information is no more contained in version.h
+        # try to read version from tools/pip_package/setup.py
+        # _VERSION = '2.20.0'
+        setup_file = Path(tf_path) / "tools" / "pip_package" / "setup.py"
+        if setup_file.exists():
+            with open(setup_file) as f:
+                for line in f:
+                    # parse with regex
+                    match = re.search(
+                        r"_VERSION[ \t]*=[ \t]*'(\d+)\.(\d+)\.(\d+)([a-zA-Z0-9]*)?'",
+                        line,
+                    )
+                    if match:
+                        major, minor, patch, suffix = match.groups()
+                        break
     if None in (major, minor, patch):
         raise RuntimeError("Failed to read TF version")
     return ".".join((major, minor, patch)) + suffix

source/cmake/Findtensorflow.cmake

@@ -291,8 +291,10 @@ if(NOT DEFINED TENSORFLOW_VERSION)
     TENSORFLOW_VERSION_RUN_RESULT_VAR TENSORFLOW_VERSION_COMPILE_RESULT_VAR
     ${CMAKE_CURRENT_BINARY_DIR}/tf_version
     "${CMAKE_CURRENT_LIST_DIR}/tf_version.cpp"
-    CMAKE_FLAGS "-DINCLUDE_DIRECTORIES:STRING=${TensorFlow_INCLUDE_DIRS}"
-    RUN_OUTPUT_VARIABLE TENSORFLOW_VERSION
+    CMAKE_FLAGS
+      "-DINCLUDE_DIRECTORIES:STRING=${TensorFlow_INCLUDE_DIRS}" LINK_LIBRARIES
+      ${TensorFlowFramework_LIBRARY} ${TensorFlow_LIBRARY}
+      RUN_OUTPUT_STDOUT_VARIABLE TENSORFLOW_VERSION
     COMPILE_OUTPUT_VARIABLE TENSORFLOW_VERSION_COMPILE_OUTPUT_VAR)
   if(NOT ${TENSORFLOW_VERSION_COMPILE_RESULT_VAR})
     message(
@@ -304,6 +306,23 @@ if(NOT DEFINED TENSORFLOW_VERSION)
   endif()
 endif()
 
+if(TENSORFLOW_VERSION VERSION_GREATER_EQUAL 2.20)
+  # since TF 2.20, macros like TF_MAJOR_VERSION, TF_MINOR_VERSION, and
+  # TF_PATCH_VERSION are not defined We manuanlly define them in our CMake files
+  # first, split TENSORFLOW_VERSION (e.g. 2.20.0rc0) to 2 20 0 rc0
+  string(REGEX MATCH "^([0-9]+)\\.([0-9]+)\\.([0-9]+)(.*)$" _match
+               ${TENSORFLOW_VERSION})
+  if(_match)
+    set(TF_MAJOR_VERSION ${CMAKE_MATCH_1})
+    set(TF_MINOR_VERSION ${CMAKE_MATCH_2})
+    set(TF_PATCH_VERSION ${CMAKE_MATCH_3})
+    # add defines
+    add_definitions(-DTF_MAJOR_VERSION=${TF_MAJOR_VERSION})
+    add_definitions(-DTF_MINOR_VERSION=${TF_MINOR_VERSION})
+    add_definitions(-DTF_PATCH_VERSION=${TF_PATCH_VERSION})
+  endif()
+endif()
+
 # print message
 if(NOT TensorFlow_FIND_QUIETLY)
   message(

source/cmake/tf_version.cpp

@@ -1,12 +1,14 @@
 // SPDX-License-Identifier: LGPL-3.0-or-later
 #include <iostream>
 
-#include "tensorflow/core/public/version.h"
+#include "tensorflow/c/c_api.h"
 
 int main(int argc, char* argv[]) {
   // See
   // https://github.com/tensorflow/tensorflow/blob/master/tensorflow/core/public/version.h
   // TF_VERSION_STRING has been available since TensorFlow v0.6
-  std::cout << TF_VERSION_STRING;
+  // Aug 2025: since TF 2.20, TF_VERSION_STRING is no more available;
+  // try to use the C API TF_Version
+  std::cout << TF_Version();
   return 0;
 }